Telephone transmitter and receiver.



No. 732,449. PATENTED JUNE 30, 1903. 0. P. SAMMONS.

TELEPHONE TRANSMITTER AND RECEIVER.

' APPLIGATIQK FILED J LY 14, 1900.

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UNITED STATES OLIVER P. SAMMONS,

Patented J 'une 30, 1903.

OF DENISON, TEXAS.

TELEPHONE TRANSMiTTER AND RECEIVER.

SPECIFICATION forming part'of Letters Patent No. 732,449, dated June 30,1903.

Application filed July 14,1900. Serial No. 23.644- (No modeld I phoneTransmitter and Receiver, of which the following is aspecification.

My invention relates to telephones, .and

more particularly to repeaters for the same;

and it has for its object to produce a device,

which maybe connected with the wires of what are known as long-distancetelephones for the purpose of taking up the weakened vibrations andrenergizing them,

as it were, and transmitting them with increased volume, whereby theordinary tone of voice may be transmitted any desired distance by simplyproviding the wires over which it is transmitted with a suflicientnumber of my improved repeaters to take up the weakened vibrations andsend them forward with increased energy and volume.

With these objects in view my invention consists in the improvedconstruction and novel arrangement of parts of a telephonerepeater, aswill be hereinafter more fully set forth.

In the accompanying drawing, which is a diagrammatic view, partlyinsection, I have shown one form of embodying my invention.

In the drawing, 1 and 2 indicate the ordinary wires of a metalliccircuit and which may extend between any two desired points ofconversation and be provided with any ordinaryinstruments at the ends,which form no parts of my invention and are therefore not shown in thedrawing. Located at suitable distances along the line are one or morerepeaters, each of which is preferably mounted upon a base 3 andinclosed within a suitable sound-proof box or casing 4:.

Located within the box 4: is a receiver 5 and a transmitter 6. Thediaphragm 7 of the receiver is supported upon shoulders 8 adjacent tothe end of its casing, and the diaphragm 9of the transmitter iscorrespondingly supported upon shoulders 10, said shoulders beingpreferably insulated from their casings. The two casings are arranged asclose together as possible, so as not to be in actual contact, andcommunicate with each other through a suitable tube or conduit ll. Theusual convexed carbon back 12 is secured, adjustably or otherwise,adjacent to the diaphragm 9 upon shoulders 13, which are also insulatedfrom the'casing. Loose-or granular carbon 14 is arranged between thediaphragm J and the carbon back l2 for assisting in transmitting theelectrical current in the usual manner. One or more permanent magnetsl5-preferably two-are located within the receiver, with the polesadjacent to the diaphragm 7, and are each provided with wires 16, whichlead to binding-posts 17 upon the base, through which connection maybemade with the wires 1 and 2 by means of branch wires 18. Aninduction-coil 19 is secured upon the base, and

the terminalsof the secondary coil are connected with binding-posts 20,through which connection maybe made with the wires 1 and 2 by means ofthe branch wires 21. The other end of one of the wires 22 oftheinduction-coil is connected with the diaphragm 9, and the other endof the other wire 23 is connected'with a battery 24. The other wire 1 25of the battery is connected with the carbon back 12.

If desired, the'branch wires 18 and 21 may be provided with the usualfuses 26 or other safety appliance to prevent injury to the instruments.

Instead of connecting the repeaters to the line in multiple, as shown inthe drawing, they may be connected with a single line by simply runningone of the branch wires to the ground in the usual manner. The box maybe rendered sound-proof in any desired manner, as by forming theexterior casing larger than the casings of the transmitter and receiverand filling the space with plaster-of-paris or other non-combustible ornonsound-transmitting material.

As above described, it is evident that by 7 using my improved repeaterthe sound of the voice can be transmitted to any desired distance, asall that is necessary is to provide the main line with one or morerepeaters at such points as will be necessary to take up the feeble orweakened vibrations in'the receiver and transmit them to the diaphragmof the receiver, where they will effect the electrical circuit of thelocal battery in such manner as to be transmitted from that point withincreased power and energy. In this manner they can be reenergized orincreased 'in volume as many times as desired to send them any distancewhatever by simply passing them through my improved transmitter. In thismanner a great saving can be effected by using less expensive wires, anda much more satisfactory result can be secured by increasing the volumeor the amplitude of the vibrations at the final receiver, whereby theconversation is rendered much more distinct than with instruments now inuse. As the apparatus is entirely automatic, it will not require theattention of an assistant except to occasionally renew the strength ofthe local batteries.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. Inatelephone-repeater, the combination with the base having asound-proof box, of a receiver arranged within the box, and atransmitter arranged also within the box, a conduit connecting thereceiver and transmitter, the diaphragms being adjacent to the ends ofthe conduit, an induction-coil and a battery connected with thetransmitter, all arranged and adapted to operate, substantially asdescribed.

2. In a telephone-repeater, the combination with a sound-proof casingdivided into compartments, a receiver in one compartment, a transmitterin the other compartment, a conduit connecting said compartments, saidreceiver comprising a diaphragm mounted and insulated from the casing atone end of said conduit, electromagnets having their poles in proximityto said diaphragm, a branch circuit from the main line, divided circuitsfrom one wire of said branch circuit connected with one terminal of eachof said magnetcoils, and divided circuits from the other wire of-saidbranch circuit connected with the other terminals of said magnet-coils,said transmitter comprisinga diaphragm mounted and insulated from thecasing at the other end of said conduit, opposite saidreceivingdiaphragm, a carbon back in proximity to said diaphragm andgrannlarcarbon particles interposed between said diaphragm and saidcarbon back, the primary coil of an induction-coil connected at oneterminal with said carbon back, a source of electricity being in saidcircuit, and at the other terminal with said diaphragm, and acommunicating line or circuit attached to the terminals of saidsecondary coil and to the main line, substantially as described.

OLIVER P. SAMMONS. \Vitnesses:

T. J. FARLEY, J r., CHAS. M. MILLS.

